Rheological characterization of thermoplasticized injectable gutta percha and resilon / 대한치과보존학회지
Journal of Korean Academy of Conservative Dentistry
;
: 377-384, 2011.
Article
in English
| WPRIM
| ID: wpr-216213
ABSTRACT
OBJECTIVES:
The purpose of this study was to observe the change in the viscoelastic properties of thermoplasticized injectable root canal filling materials as a function of temperature and to compare the handling characteristics of these materials. MATERIALS ANDMETHODS:
Three commercial gutta perchas and Resilon (Pentron Clinical Technologies) in a pellet form were heated in the Obtura-II system (Obtura Spartan) at 140degrees C and 200degrees C, and the extrusion temperature of the thermoplasticized materials was measured. The viscoelastic properties of the materials as a function of temperature were evaluated using a rheometer. The elastic modulus G', viscous modulus G", loss tangent tandelta, and complex viscosity eta* were determined. The phase transition temperature was determined by both the rheometer and a differential scanning calorimeter (DSC). The consistency of the materials was compared under compacting pressure at 60degrees C and 40degrees C by a squeeze test.RESULTS:
The three gutta perchas had dissimilar profiles in viscoelastic properties with varying temperature. The phase transition of softened materials into solidification occurred at 40degrees C to 50degrees C, and the onset temperatures obtained by a rheometer and a DSC were similar to each other. The onset temperature of phase transition and the consistency upon compaction pressure were different among the materials (p < 0.05). Resilon had a rheologically similar pattern to the gutta perchas, and was featured between high and low-flow gutta perchas.CONCLUSIONS:
The rheological characteristics of the thermoplasticized root canal filling materials changed under a cooling process. The dissimilar viscoelastic properties among the materials require different handling characteristics during an injecting and compacting procedure.
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Root Canal Filling Materials
/
Viscosity
/
Phase Transition
/
Elastic Modulus
/
Gutta-Percha
/
Handling, Psychological
/
Hot Temperature
Language:
English
Journal:
Journal of Korean Academy of Conservative Dentistry
Year:
2011
Type:
Article
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